“bun THERMOWELL II” is a wifi temperature recorder and alarm system with two external sensors designed for installation in the fluids stream. It is powered by 2 replaceable AA batteries for up to 6 years and connects directly to Wi-Fi. More than an accurate meter and a reliable logger, “bun THERMOWELL” is also a cloud-based alarm system. All setting parameters like measurement intervals, upload intervals, minimum, and maximum allowed temperature thresholds can be set through a web-based application on any platform. It sends out email and text message alarms as soon as temperature exceeds or falls below preset limits. It also provides access to the records history, graphs, and periodical reports. It can be used for monitoring HVAC systems, boilers, water heaters, chillers, food or medicine processing facilities, etc.